bonsoir,
A = x ( 3 x - 2 - 7 x - 8 )
A = x ( - 4 x - 10 )
B = ( 6 x + 8) ( 5 x - 3 + 8 x - 3 )
B = ( 6 x + 8 ) ( 13 x - 6 )
c = (6 x + 4 ) ( 5 x - 2 + 1 )
C = ( 6 x + 4 ) ( 5 x - 1 )
d = ( 2 x - 9) ( 2 x + 8 + 9 x - 8 )
d = ( 2 x - 9 ) ( 11 x )
e = ( a - 5 + a - 1 ) ( a - 5 - a + 1 )
E = ( 2 a - 6 ) ( - 4 ) = - 4 ( 2 a + 6 )